Plain Facts for Old and Young

by John Harvey Kellogg

No person suffering with a contagious or infectious disease has any right to communicate the same to another. Indeed, it is the moral duty of every person so affected to do all in his power for the protection of others from the same cause of suffering.

2. Persons having a marked hereditary tendency to disease must not marry those having a similar tendency.

Every physician knows only too well the powerful influence of hereditary causes in determining the length of human life. Persons, one or both of whose parents have died of consumption, are very likely to die of the same disease, and frequently at about the same age. The children of such parents are commonly feeble and puny, and die early if they survive infancy. When both parents possess the consumptive tendency, the chance for life in the offspring is very poor indeed. The same may be said of those suffering with cancer, epilepsy, insanity, etc. Persons with a strong tendency to any one of the diseases mentioned should in no case marry. If there is but a slight morbid tendency, marriage may be admissible, but only with a partner possessing robust health.

3. Should cousins marry?

Writers have devoted a good deal of attention to this subject, and we have been shown statistics, reports of imbecile asylums, etc., for the purpose of proving that the marriage of cousins results in the production of idiots, and other defectives; but the results of more careful examinations of the subject invalidate the views heretofore held, and it must be acknowledged that when both parties are healthy there is no more liability of mental incompetency in the children of cousins, than in the offspring of persons more remotely related. It must be added, however, that there are other reasons why the marriage of cousins is not to be generally recommended. Besides the fact that the feeling existing between cousins is often only that which is felt by brothers and sisters for each other, there is the still more important fact that on account of the blood relation, unions of this kind are more apt than others to bring together persons having similar morbid tendencies.

4. Persons having serious congenital deformities should not marry.

The reason for this rule is obvious. Persons suffering with serious congenital defects, as natural blindness, deafness, deformity of the limbs, or defective development of any part, will be more or less likely to transmit the same deformities or deficiencies to their children. There are, of course, cases of natural blindness, as well as of disability in other respects, to which this rule does not apply, the natural process of development not being seriously defective. It has even been observed that there is a slight tendency to the reproduction in the offspring, of deformity which has been artificially produced in the parents, and has existed for a long time.

Many ancient nations observed this rule. Infants born cripples were strangled at birth or left to die. A Spartan king was once required by his people to pay a heavy fine for taking a wife who was inferior in size.

5. Criminals should not marry.

It has been satisfactorily shown by thorough and scientific investigation that criminals often receive their evil proclivities from their parents. What are known as the criminal classes, which are responsible for the greater part of the crime committed, are constantly and greatly on the increase. There is no doubt but that inheritance is largely responsible for the continued increase of crime and criminals. A drunkard begets in his child a thirst for liquor, which is augmented by the mother's use of ale or lager during gestation and nursing, and the child enters the world with a natural taste for intoxicants. A thief transmits to his offspring a secretive, dishonest, sneaking disposition; and the child comes into the world ticketed for the State prison by the nearest route. So with other evil tendencies. By legislation or by some other means, measures should be speedily adopted for the prevention of this rapid increase of criminals, if there is any feasible plan which can be adopted. We offer no suggestion on this point, but it is one well worthy of the consideration of philanthropic statesmen.